You probably will. The Penumbra games are pretty darn awesome. They won't make you ♥♥♥♥ your pants like Amnesia, but it still will freak you out a good amount. I thought the story was really good in Penumbra as well. The music is amazing and it's enviornment is pretty creepy. I'd say go for it.

Ya the Penumbra series is great I didn't finish Requiem, but up till there is pretty good. Btw in Overture when you do get a weapon the game is still scary because the weapons are pretty dodgy you're better off just running instead of fighting.